21403575

素因数分解:

$3^3\times 5^2\times {\mathrm{37}}^1\times {\mathrm{857}}^1$

素因数の和:913

約数の個数: 48

約数和(自身を含む): 40428960

約数和(自身を除く): 19025385

約数列:

[1, 3, 5, 9, 15, 25, 27, 37, 45, 75, 111, 135, 185, 225, 333, 555, 675, 857, 925, 999, 1665, 2571, 2775, 4285, 4995, 7713, 8325, 12855, 21425, 23139, 24975, 31709, 38565, 64275, 95127, 115695, 158545, 192825, 285381, 475635, 578475, 792725, 856143, 1426905, 2378175, 4280715, 7134525, 21403575]

約数ペア:

[(1, 21403575), (3, 7134525), (5, 4280715), (9, 2378175), (15, 1426905), (25, 856143), (27, 792725), (37, 578475), (45, 475635), (75, 285381), (111, 192825), (135, 158545), (185, 115695), (225, 95127), (333, 64275), (555, 38565), (675, 31709), (857, 24975), (925, 23139), (999, 21425), (1665, 12855), (2571, 8325), (2775, 7713), (4285, 4995)]